| Tim Leonard Construction | Timothy Charles Leonard | — | (408) 859 0686 | GC, remodel, ADU | Discovery Bay · Contra Costa County | — | — |
| Tim Millette Landscape | Tim Millette Landscape | — | (925) 878 9245 | Windows, patio, painters | Orinda · Contra Costa County | — | — |
| Tim Smith Handyman Services | Timothy William Smith | — | (510) 919 0821 | GC, remodel, ADU | Pacheco · Contra Costa County | — | — |
| Timberlab INC | Zachary Kaiser Brehm | — | (925) 602 6400 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Timberland Tree Care | Timberland Tree Care | — | (925) 691 8733 | Tree | Concord · Contra Costa County | — | — |
| Timberline Hardwood Floor INC | Karl Krahn Von Hacht | — | (925) 299 1020 | Other | Moraga · Contra Costa County | — | — |
| Timberline Roofing Solutions INC | Daniel Alfred Rich | — | (510) 889 1329 | Other roofers | Danville · Contra Costa County | — | — |
| Timmerman Engineering Construction | Peter Donald Timmerman | — | (925) 457 3781 | Other | Walnut Creek · Contra Costa County | — | — |
| Timmit | Cheng Huei Su | — | (925) 437 1874 | GC, remodel, ADU | Pacheco · Contra Costa County | — | — |
| Timothy P Fehr | Timothy P Fehr | — | (925) 339 4965 | GC, remodel, ADU | Discovery Bay · Contra Costa County | — | — |
| Timothy Shao Chun Chu | Timothy Shao Chun Chu | — | (925) 708 8321 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Tincher Consulting & Inspection Services | Tincher Consulting & Inspection Services | — | (925) 521-9500 | Inspectors | Pleasant Hill · Contra Costa County | — | — |
| Tinka Construction | Gheorghita Catalin Ilie | — | (510) 695 4119 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Tino's Tree Service | Crisostomo Ordonez Juventino | — | (510) 932 3088 | Tree | Richmond · Contra Costa County | — | — |
| Tioga Construction INC | Steven Patrick Thomas | — | (925) 945 6266 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Tisza Shastid | Tisza Shastid | — | (510) 517 2697 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Titan General Construction | Rosales Vargas Saul | — | (925) 968 5514 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Titus Mrf Services | Kathryn Ann Centers | mccenters@titusservices.net | (909) 357 3156 | Other | Danville · Contra Costa County | — | — |
| Tks Cold Storage Mfg & Construction | Elena Tolentino Comstock | — | (510) 652 4100 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Tm Flooring INC | Thanh Van Huynh | — | (925) 844 4628 | Other | Brentwood · Contra Costa County | — | — |
| Tmd Remodeling Incorporated | Todd Michael Derita | — | (925) 382 0333 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Tnd Engineering & Construction | Do Van Tran | — | (925) 570 4962 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Tnh Development LLC | Thomas Henry Borst | — | (847) 525 3960 | Electricians | Concord · Contra Costa County | — | — |
| Tobias Builders | Tobias Builders | — | (925) 298 2599 | Electricians | Lafayette · Contra Costa County | — | — |
| Todd Gilens | Todd Gilens | template.placeholder@gmail.com | (415) 309 3584 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Todd Hill Construction | Todd Joseph Hill | — | (510) 812 3951 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Tokes Electric | Eric Mercado Martinez | — | (925) 826 8454 | Electricians | Bay Point · Contra Costa County | — | — |
| Toledo Construction Corporation | Gerardo Jr Toledo Alvarez | — | (669) 253 5384 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Toledo's Hardwood Floors | Toledo's Hardwood Floors | — | (510) 685 7562 | Other | San Pablo · Contra Costa County | — | — |
| Tolento's Renovations Services INC | Leonardo Tolento | — | (925) 595 7743 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| Tom Armstrong Sales And Furniture Installation | Thomas Euler Armstrong | — | (415) 760 4094 | Other | Pleasant Hill · Contra Costa County | — | — |
| Tom C Ramirez Construction Co INC | Thomas Charles Ramirez | — | (925) 899 9700 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Tom Oakes Woodworks INC | Thomas William Oakes | — | (925) 783 1909 | Other | Oakley · Contra Costa County | — | — |
| Tommystar Construction | Tommy Doan Nguyen | — | (510) 367 0255 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Tony Lucha General Contractor | Tony Lucha General Contractor | — | (925) 408 4385 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| Tony's Home Repair | Tony's Home Repair | — | (925) 577 1926 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Top Choice Painting | Top Choice Painting | — | (510) 359 8521 | Windows, patio, painters | Richmond · Contra Costa County | — | — |
| Top Knot Construction | Michael Arthur Pelletier | — | (925) 435 9871 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Top Level Security | Top Level Security | — | (925) 588 8245 | Electricians | Martinez · Contra Costa County | — | — |
| Top Notch Remodeling | Top Notch Remodeling | — | (925) 819 6241 | GC, remodel, ADU | Danville · Contra Costa County | — | — |